Game crash

Hey first off wanna say love the game so far but I've encountered a problem. I was in the middle of an assassination mission when someone offered coop I accepted. The vote box appeared and I thought I would just be tele to the mission he had selected. But what happened is my toon disappeared and it said I had left the game in the chat box so I waited. Nothing happened I was stuck staring at the room I was fighting in. So I task managed and closed the program now when I open the game it just takes me to the loading but nothing happens. I have even tried uninstall/reinstall from steam pls help.